Human Circulation

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Across
  1. 4. the top chambers of the heart
  2. 5. means something yo do not consciously control
  3. 8. the type of muscle in the heart
  4. 9. the system that while blood cells form
  5. 10. the largest vein
  6. 12. red blood cells that carry oxygen
  7. 14. small veins
  8. 16. protein on red blood cells that alow them to carry oxygen
  9. 18. vessels which are low in pressure
  10. 19. vessel which leads to all the body
  11. 20. the chambers at the bottom of the heart
  12. 21. structure in the lungs that is surrounded by capillaries
Down
  1. 1. number of chambers in the human heart
  2. 2. centre part of the brain that sends pacing signals to the heart
  3. 3. vessel leading from the lungs to the heart
  4. 6. keep blood flowing one way
  5. 7. number of pumps in the body
  6. 11. lead towards the heart
  7. 13. white blood cells
  8. 15. means lungs
  9. 17. small arteries
  10. 22. oxygenates the blood